Abstract
The concentration of O 2 in 1 M H 2SO 4 solution in the vicinity of the O 2-evolving smooth Pt anode was measured as a function of anodic cd i a using the galvanostatic potential—transient method. The solution near the O 2-evolving anode was supersaturated with O 2. When the anodic current was interrupted, supersaturated concentration C * decreased at a rate proportional to C * C 0 , where C 0 is the solubility of O 2 in the electrolyte at 1 atm. The rate constant of the decay of the supersaturation under the open circuit condition was measured to be 0.069 sec −1 at 25°C. At i a < 40 mA/cm 2 there was a linear relation between log( C * C 0 ) and log i a . At i a > 200 mA/cm 2, however, the supersaturation exhibited a limiting value of 9.0 × 10 −2 mol/l.
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